1 Answer
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You can't have two default gateways because it's an oxymoron. Another phrase for Default Gateway would be "Gateway of Last Resort", and two things can't be last.

It may help you visualise this if you remember that Windows routing (And that includes your default gateway(s)) is a global setting for all NICs, IP's and interfaces.

You may need to add the metric and interface option to the command. Please try with those options and then post the results of route print here if that doesn't help. Additionally, if you want this setting to persist across reboots, you will need to add -p after route: